Aldehydes, Ketones and Carboxylic Acids
7 Board Chemistry previous year questions on Aldehydes, Ketones and Carboxylic Acids — options free on every question; 1 include the answer & explanation free, the rest unlock with PYQ Pass.
\({\mathrm{CH}}_{3}-\mathrm{C}\equiv \mathrm{CH}\overset{\mathrm{Pd}/\mathrm{C}}{\underset{{\mathrm{H}}_{2}}{\to }}\mathrm{A}\overset{(\mathrm{i}){\mathrm{O}}_{3}}{\underset{(\mathrm{ii})\mathrm{Zn},{\mathrm{H}}_{2}\mathrm{O}}{\to }}\mathrm{B}+\mathrm{C}\)
Products B and C are :
Memory Based Question 28/Jan/25 Evening shift
Ethanal and formaldehyde
Step 1: Hydrogenation (H₂/Pd-C)
Propyne (CH₃-C≡CH) undergoes partial hydrogenation to form propene (CH₃-CH=CH₂).
Step 2: Ozonolysis (O₃/Zn, H₂O)
Ozonolysis cleaves the C=C bond in propene, producing:
- Ethanal (CH₃CHO)
- Formaldehyde (HCHO)
Thus, the correct answer is: (A) Ethanal and Formaldehyde.
Both acetaldehyde and acetone (individually) undergo which of the following reactions?
A. Iodoform Reaction
B. Cannizzaro Reaction
C. Aldol Condensation
D. Tollen's Test
E. Clemmensen Reduction
Choose the correct answer from the options given below
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Which of the following arrangements with respect to their reactivity in nucleophilic addition reaction is correct?
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Both acetaldehyde and acetone (individually) undergo which of the following reactions,
A) lodoform Reaction
B) Cannizzaro Reaction
C) Aldol condensation.
D) Tollen's test
E) Clemmesen Reduction
Memory Based Question 28/Jan/25 Morning shift
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Consider the following sequence of reaction\({\mathrm{C}}_{6}{\mathrm{H}}_{12}\overset{\mathrm{Se}/∆}{\to }\mathrm{A}\overset{{\mathrm{CH}}_{3}-\mathrm{Cl}}{\underset{{\mathrm{AlCl}}_{3}}{\to }}\mathrm{B}\overset{{\mathrm{CrO}}_{2}{\mathrm{Cl}}_{2}}{\underset{{{\mathrm{H}}_{3}\mathrm{O}}^{+}}{\to }}\mathrm{C}\)
Choose the correct option about maior product
Memory Based Question 28/Jan/25 Evening shift
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Which is the correct order of nucleophilic addition
1. Acetophenone,
2. p-nitrobenzaldehyde
3. benzaldehyde,
4. p-tolualdehyde
(Memory Based JEE Mains 24/01/2025 ,Shift -1)
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Match List-I with List-II.
| List-I (Reactions) | List-II (Reagent) | ||
| (A) | Hoffmann Degradation | (I) | Conc. KOH, \(∆\) |
| (B) | Clemmensen reduction | (II) | CHCl3, NaOH/\({\mathrm{H}}_{3}{\mathrm{O}}^{⊕}\) |
| (C) | Cannizzaro reaction | (III) | Br2, NaOH |
| (D) | Reimer-Tiemann Reaction | (IV) | Zn.Hg/HCl |
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